Knife for cutting-machines.



A. E. HOPKINS & 0- S- FELLOWS.

KNIVES FOR CUTTING MACHINES.

APPLICATION TILED JAN. 2, 1913.

Patented Mar. 16, 1915.

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ARCHIBALD E. HOPKINS AND GLIN S. FELLOWS, 0F MIDDLETOWN, NEW YORK, ASSIGNOES TO IDEAL TRAPPING MACHINE COMPANY, OF MIDDLETOVTII, NEW

YOBK, CORPORATION OF NEW YORK.

KNIFE FOB CUTTING-MACHINES.

Patented Mar. 16, 1915.

Original application filed February 1a, 1908, Serial No. 415,873. Divided and this appIication filed January 2, 1913. Serial No. 739,676.

niNs and OLIN S. FnLLows, citizens of the United States, and residents of the city of li/fiddletown, in the county of Orange and State of New York, have invented certain new and useful Improvements in Knives for Cutting-Machines; and we hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numbers of reference marked thereon, which form a part of this specification.

The present application constitutes a division of our prior application for patent for Automatic feeding and cutting mechanism for plastic material, filed on the llth day of February, 1908, Serial No. 415,878, in which a rotative table is provided with peripherally arranged, inwardly facing knives, against which the material to be cut was forced by suitable mechanism, although, of course, such knives may be employed in connection with machines of any kind with which they are adapted for use.

The object of this invention is to afford a construction which insures the utmost accuracy in setting the knives with reference to the table and the material to be operated upon.

It is also an object of the invention to afford a construction of such a nature as to permit the knives after each sharpening to be almost instantaneously returned into exact adjustment without the necessity of measurements.

It is also an object of the invention to en able the knives embodying my invention to be ground until practically wholly used up.

It is an important object of the invention to afford a knife of such a construction and shape that when set in a circular table with the edges facing inwardly, the bevel of the blade is such with reference to the radius of the table as to afford ample clearance for the cut material beyond the cutting edges of the knives, thereby preventing jamming.

It is also an object of the invention to afford a construction in which the shanks of all the knives. are adapted to fit closely on three sides in a suitable socket therefor to rigidly hold said knives, when adjusted from movement relative the table.

The invention embraces the matters hereinafter described and more fully pointed out and defined in the appended claims.

In the drawings: Figure 1 is a fragmentary top plan view of a circular cutting table having peripherally arranged knives embodying my invention. Fig. 2 is a perspective View of one of the knives showing the same removed from the cutting table. Fig. 3 is a section of the cutting table taken alongside of the shank of the knife to illustrate the means for engaging said knives on the table. Fig. 4 is an enlarged fragmentary detail illustrating the clearance.

As shown in the drawings: 1, indicates a circular rotative cutting table, and 2 and 3, indicate kneading presser feet which act to press and force the strip 4, of material to be cut against the peripherally arranged knives on said table. 5, indicates a knife set in the presser foot 3, adapted to coact with the peripherally arranged knives 7 to score the strip on the inner side to facilitate the cutting. Any suitable mechanism may be employed for rotating the table and operating the presser feet and the knife 5. These form no part of my present invention, inasmuch as they are fully set forth in the other application for patent hereinbefore referred to.

The periphery of the cutting table 1, is provided at uniform distances apart with radial oblong seats of uniform width and depth to receive the oblong shanks 6, which fit closely thereon on three sides, and whereby each knife 7, is rigidly held in place near the periphery of the table. Said knives 7,

are constructed with the cutting edge in alinement with the front or inner edge of the shank, as shown in Figs. 2 and 3, and said blade of the knife is wider than said shank to permit of repeated sharpening of the blade and the corresponding dressing of the front edge of the shank to maintain the alinement thereof for the cutting edge I so that said knife may be sharpened and used until very little of the shank remains.

The bevel of the blade of the knives, as shown more fully in Fig. 4, is such with reference to the radius that said knives afford a clearance therebetween or in other words, the cutting or inner edges of said knives are nearer together than the outer edges or sides of said knives. This angle may vary with the radius of the cutting table and the distance of the knives from the center and the distance between the knives. Each of said knives is secured in place by means of a set screw 8, threaded into a suitable seat therefor in the back of. each of said slots, said set screw extending inwardly and bearingagainst the outer side of the shank and forcing the straight inner face thereof positively .against the inner vertical shoulder afforded at the inner end of saidslot. Said shanks are, of course, made of sufficient length to afiiord along bearing'in the table and extend sufficiently below said set screw -8, as to afiord a bracing construction there- "for adapted to withstand great outward pressure.

The operation is as follows: When in use, ,a sufficient clearance is afforded between the knivesto permit a free discharge of the material from therebetween, inasmuch as the rear edges of adjacent knives are farther apart than the cutting edges thereof. Inasmuch as the inner end of the slots in the table afford vertical shoulders or walls, said knives must invariably be set in the exact adjustment (if ground, with the cutting edge .thereof in alinement with the inner or frontedge of theshank) as shown in Figs. Q-and 3. This is of great "importance, owing to the great facility it affords in setting the knives after sharpening the same and furthermore, if in grinding or sharpening the knives theshanks are at all times maintained in alinement with the cutting edge thereof, the knife may be gradually worn away by sharpening and resharpening until very little remains, or, in other words, so long as a :sufiicient amount of 'metal in the shank remains to afford a 'sufiicient adjustment in the periphery of the table.

Qwing to the fact that the set screw 8, bears against the back of the shank at the .upper end thereof, and each shank fits closely in each slot in the periphery of the table with the shank bearing for its .entire front or inner edge against the face of the slot, it follows that a bracing effect is afforded so that pressure on the cutting edge of each knife is transferredto the set screw which positively bears thereagainst.

,Of course, the exact angle of inclination of th lad may va y wit t d st c of the peripherally arranged knives from the center, and therefore we do not desire to be limited to any particular angle, fo,r obviously all that is necessary or desirable is to afford such a bevel or angle for the knife blades that the adjacent substantially flat faces of the knives shall not converge to wedge the material therebetween but shall instead pref ly verge uf c nt y o afiond p 1 c ea anc or h cu m teri l, as s wn in ig- 4 Of course, details of the construction may vary and we therefore do not purpose limiting this application for patent otherwise than necessitated-bythe prior art.

WVe claim as our invention:

1. Aknife of the class described embracing a relatively thin stub blade, having a straight cutting edge parallel throughout its entire length with both rear edges, a rectangular shank integral with the blade and having the inner face in alinement with the cutting edge of the blade, said shank being narrower than the widest part of the blade.

2. A knife of the class described embracing a shank at one end shaped :to fit a complemental socket on three sides, a pointless blade integral with the shank and having its. cutting edge'in'alinement with one of the faces of the shank, asaidblade being of a depth to extend rearwardlybeyond the shank.

3. A knife for the purposespecified embracing a shank at one end, having a straight front face, a pointless cutting blade integral therewith and having its cutting edge in alinement with the front face of the shank, saidabladerbeing of a depth to extend rearwardly beyond :the :shank and of a tapering thickness toward cuttingedge such that a pluralityof said knives arranged to face radially inward at a given rcircumfei once afford a distance therebetween at the rear edges greatenthan 'therdistance between the same at the cutting edges.

4. A knife comprising a rectangular shank at one end, a pointless blade wider at ithe-top than the shank having a cutting edge in alinement with one .edge of the shank and said blade providing a clearance on each side between the cutting edge and back edges- 5. A knife comprising a shank at one end having parallel side faces and parallel front and r a faces, a s u b ade o greate width at its widest part than the-shank having a cutting edge in alinement with the front face of the shank.

6. A knife for cutting machines compris-j ing a re ta g ar shank at e e d a d integral uniformly cross-sectioned triangular iblade of greater depth than the shank ground on each side beyond the rear edge of the shank to, provide clearance beyond the cutting edge, said {blade being offset at its rear edge beyond the shank to afford greater width.

In testimony whereofwe have hereunto subscribed our names the presence of two subscribing witnesses.

' ARCHIQBALD E. HOPKINS.

OLIN S. FELL WS.

Witnesses: i

' FRED. B. WIL IAMS,

J OHN C. FBnY.

9pm 91 th Pa ent ma e tei r fi c n h, y dd es ing the flomm ssioner o1 Batents,

' i WashingtoznD. O." i I i i i 

